Why in euchromatin gene can expressed all time except during cell division?

During cell division, the chromatin condenses into tightly packed structures called heterochromatin, which makes it difficult for the genes to be accessed and transcribed. This is necessary for the accurate segregation of genetic material during cell division.

In contrast, euchromatin is a less condensed form of chromatin that allows for easier access to the genes, making them available for transcription and expression. This is why genes in euchromatin can be expressed at all times except during cell division when the chromatin is condensed into heterochromatin.

Euchromatin is a type of chromatin that is loosely packed and is found in regions of DNA that are actively transcribed. Gene expression refers to the process by which the information encoded in a gene is used to direct the synthesis of a functional gene product, such as a protein.

Euchromatin is accessible to the transcriptional machinery, which is necessary for gene expression. The transcriptional machinery consists of proteins that bind to the DNA and facilitate the transcription of the DNA into messenger RNA (mRNA). mRNA is then translated into protein by the ribosomes.

Therefore, genes that are located in euchromatin can be expressed all the time except during cell division. During cell division, the chromatin is condensed into chromosomes, which makes the DNA less accessible to the transcriptional machinery. As a result, gene expression is generally repressed during cell division.

Once cell division is complete, the chromatin decondenses back into euchromatin, which allows gene expression to resume.